/*
 *  Copyright 2016 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

package org.webrtc;

import android.content.Context;
import android.graphics.Matrix;
import android.view.WindowManager;
import android.view.Surface;

interface CameraSession {
    enum FailureType {ERROR, DISCONNECTED}

    // Callbacks are fired on the camera thread.
    interface CreateSessionCallback {
        void onDone(CameraSession session);

        void onFailure(FailureType failureType, String error);
    }

    // Events are fired on the camera thread.
    interface Events {
        void onCameraOpening();

        void onCameraError(CameraSession session, String error);

        void onCameraDisconnected(CameraSession session);

        void onCameraClosed(CameraSession session);

        void onFrameCaptured(CameraSession session, VideoFrame frame);
    }

    /**
     * Stops the capture. Waits until no more calls to capture observer will be made.
     * If waitCameraStop is true, also waits for the camera to stop.
     */
    void stop();

    static int getDeviceOrientation(Context context) {
        final WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        switch (wm.getDefaultDisplay().getRotation()) {
            case Surface.ROTATION_90:
                return 90;
            case Surface.ROTATION_180:
                return 180;
            case Surface.ROTATION_270:
                return 270;
            case Surface.ROTATION_0:
            default:
                return 0;
        }
    }

    static VideoFrame.TextureBuffer createTextureBufferWithModifiedTransformMatrix(
            TextureBufferImpl buffer, boolean mirror, int rotation) {
        final Matrix transformMatrix = new Matrix();
        // Perform mirror and rotation around (0.5, 0.5) since that is the center of the texture.
        transformMatrix.preTranslate(/* dx= */ 0.5f, /* dy= */ 0.5f);
        if (mirror) {
            transformMatrix.preScale(/* sx= */ -1f, /* sy= */ 1f);
        }
        transformMatrix.preRotate(rotation);
        transformMatrix.preTranslate(/* dx= */ -0.5f, /* dy= */ -0.5f);

        // The width and height are not affected by rotation since Camera2Session has set them to the
        // value they should be after undoing the rotation.
        return buffer.applyTransformMatrix(transformMatrix, buffer.getWidth(), buffer.getHeight());
    }
}
